Cylinder grinder



Se t. 11, 1934. HUTTO 1,972,890

CYLINDER GRINDER Filed Nov. 5, 1927 2 Sheets-Sheet l INVENTOR. Maize/v(3 W 0 A TTORNEY$ Sept. 11, 1934. Q HUTTO 1,972,890

CYLINDER GRINDER Filed Nov. 5, 1927 2 Sheets-Sheet 2 I N V EN TOR.MfiJJf/V Z 40770 A TTORNEY6 Patented Sept. 11, 1934 1,972,sso

1,972,890 CYLINDER Gunman- Marsden C. Hutto, Detroit, Mich., assignor toHutto Engineering Company, Inc., a corporation of Michigan ApplicationNovember 5', 1927, Serial No. 231,365

3 Claims.

This invention relates to cylinder grinders, and the object is toprovide a new and improved construction in devices of this classresulting in a greater freedom of movement and more accurate operationof the grinding elements than is possible with the usual formerconstructions.

Many previous cylinder grinders for instance as is shown in my UnitedStates Letters Patent No. 1,610,681, issued December 14, 1926, have aseries of grinding stones supported in carriers and the carriers areeach provided with a pair of space pins riding in apertures in the bodyof the device and supported at the inner ends by an adjusting element.

In all such former structures in which pins are utilized to engagethrough apertures of the body, the pins are a fairly close fit in theapertures and thus, due to the rigidity of the pairs of pins relative'to the carrier and their movement on parallel lines radially of thebody, the extent to whichthe carriers may tilt. relative to thelongitudinal axis of the body is limited by the permissible clearance ofthe pins in their apertures. In the grinding of a tapered cylinder forinstance the extent of movement of the stone carriers radially atopposite ends sometimes differs to such an extent that the pins tend. tobind in the apertures and even, in extreme cases, to "lock" in thetilted position.

The particular purpose and feature of this invention is to'provide agrinder of the general character disclosed in my said Patent No.1,610,681 in which the stone carrier is not attached to the meansemployed to contact the adjusting cones but is supported from lateralmovement by the structure of the body (it conveniently being channeledfor the purpose), and in the place of the pair of pins heretoforeemployed I .utilize a single plate having two feet or contactingportions one for each of the cones and on the opposite side having twoprojecting points or lug like portions to contact the stone carrieradjacent opposite ends thereof, the plate being free to assume any ofthe positions required to permit or cause the face of the stone toassume a position at an angle to the axis of the body of the tool.Additional features of the invention are involved in the specificdetails of construction of the adjusting plate and the provision ofmeans for reducing wear while preventing natural longitudinal movementof the plate relative to the body of the tool. These and other objectsand novel features of the invention are hereinafter more fully describedand claimed, and the preferred form of construction of a cylindergrinder embodying my invention is-shown in the accompanying drawings inwhich- Fig. 1 is a longitudinal section of my improved cylinder grinder.

Fig. 2 is a cross section thereof taken on line 22 of Fig. 1. Fig. 3 isa section taken on line 33 of Fig. 1. Fig. 4 isa perspective view of theadjusting plate.

Fig. 5 is a perspective view of a portion of the stone and its carrier.

Generically the 'tool herein described and claimed operates on the samegeneral principle as that of the cylinder grinder shown in U. S. PatentNo. 1,610,681--that' is, there is a body, a series of abrasives andcarriers therefor extending longitudinally of the body, and oppositelydisposed cone members in an adjustably fixed relation within theinterior of the body which through the means interposed between thecarrier and the T5 cones may cause the faces of the abrasives or stonesto contact the wall of a cylinder nonparallel with the axis of the tool,the cones providing a positive backing for the abrasives in any positionassumed during reciprocation and rotation of the tool of the cylinder.

In the arrangement of the device herein shown the body of the grinder isindicated at 1 and this body is provided with a pair of ring likemembers 2 and 3 extending outwardly from the body adjacent each endthereof. The body is also provided with a central longitudinal apertureor bore 4 in which are positioned the spaced adjusting cones 5 and 6connected by a rod '7 which is threaded at one end for engagement withthe threaded central aperture of thecone 5. The opposite cone 6 ispreferably free to turn on the rod and is recessed to receive the head 8thereof. This head 8 is provided with a slot by means of which the rod'7 may be turned to -vary the distance apart of the cones and the cone 6is held in its position against the head by means of a coiled spring 9interposed between the said cones about the rod 7.

and ring like points is to hold the cone members from lateral movementin the bore of the tool but ,permitting sliding thereof longitudinally.These ring like portions 12 and 13 are preferably formed integrally withthe cone members. This body is provided with a head as indicated at 14and this v the spirit of this invention.

head is to be understood as being of a character adapted for attachmentto the reciprocating and rotating means (not here shown). and it isfurther to be understood that any means of attachment of the body to adriver of the desired char- .acter may be employed without departingfrom As will be understood more clearly from Fig. 2 each ring likemember 2 and 3 extends outwardly from the main portion 1 of the body andare preferably integrally formed therewith. The periphcries of these,ring members are notched as indicated at 15 providing portions 16 whichare slotted on a line parallel with the axis of the tool to receive thecarriers 17 which are of channel like form in cross section. Theabrasives or stones 18 are set into these channels of the car- .riers bymeans of a cement or solder preferably after the manner of mounting asdisclosed in my pending application Serial No. 116,835, filed June 18,1926. As will be understood from Fig. 5 the carriers on this oppositeside wall are provided 'with a projection 19 having rounded end portions20, 21 which loosely fit between the adjacent faces of the two ringportions 2 and 3 the purpose of which is to prevent longitudinalmovement of the carrier relative to the tool in the grinding operation.Whatever the method employed of securing the abrasive in the carrier itis desirable that the outer or grinding face of the abrasive should beparallel with the base of the supporting channel 17 in order that thesaid faces shall all cut the same circle in their revolution of thetool.

In order that the abrasive holders may tilt so that the grinding facesmay, if the character of the work as demanded, operate at an angle tothe of the body and engaging the oppositely disposed cones at theirinner ends but too great freedom -of movement of the pins in theapertures cause "the tool to chatter and vibrate in its operation .whichis undesirable and also upon the'tilting of the carrier through movementof the adjusting cones the movement is occasionally sufilciently greatto cause the pins to bind or lock in the apertures. To obviate thisdimculty I have dispensed with the pins such as were provided in thecylinder grinder shown in my former patent and the plate in its desiredposition without material longitudinal movement in its slot I providehardened pins 24 and 25 inserted in apertures formed near the end ofeach slot in the ring member and extending nearly to the wall ofthecentral bore. The outer ends of these pins are preferably peened overas indicated at 26- to hold the pins from dropping out of the body whenthe stone carriers 17 are not in place. These pins are so spaced theyare practically the same distance between opposite adjacent facesthereof as the distance between the high points 27 and 28 of the plate23 it being observed that the plate at the end isformed with a curvedpart providing these high points, the remaining faces of the endsextending inwardly from the curved portion to per-.

'mit the plate to tilt in its slot without binding .the. upper faces ofwhich may be slightly rounded on which the carriers are supported, itbeing noted that the carriers are unattachedto the body or to the platebut are held in their respective slots in contact with these lugs 31 and32 of the respective plates by springs 33 and 34 at opposite ends. Thesesprings engage over pins 35 and 36 provided at opposite ends of each ofthe carriers and are of the usual garter type and the purpose of whichis to contract the carriers. The rounded ends of. the lugs 31 and 32provide a practically live contact of the carrier, with the adjustingplate 23 in each instance which is maintained throughout the possibletilting movement of the stone and carrier indicated generally by dottedlines 40 in Fig. l which is the position assumed by each of the carrierswhen adjusted to contact a cylinder wall at an angle to the cylinderaxis. 1

In the operation of the tool it is evident from the foregoingdescription that the control element consisting of two cones and theadjusting screw and spring float asa unit with the cones in anadjustably fixed or rigid'relation on the longitudinal axis of the toolsubject to control in position by reason of contact with the respectivefeet or lug portions 29 and 31 of the adjusting plates 3. This will bemore clearly understood from t e following- This tool is first set intothe cylinder to be ground approximately the full length of theabrasives. The cone adjusting screw '7 is then turned, by means of ascrew driverfor instance, inserted into the bore from that end, whichdraws the cones together and thus the abrasives and carriers areexpanded to pressure contact with the cylinder wall. If the cylinder betapered in form the pressure at that part of the cylinder of leastdiameter will cause the cones to move longitudinally so that the feetportions 29 for instance may occupy a position on the cone 5 of less. orgreater diameter than that occupied by the lug portions 30 on the cones6 and upon the setting of the stones to the desired pressure contactwith the cylinder walls the tool through proper attachment to a drivingelement, is caused to be reciprocated and simultaneously rotated in thecylinder. In this movement longitudinally of the cylinder, due to thetapered character or out of round condition of the cylinder the pressureexerted on the cones by reason of contact of the abrasives with thecylinder wall may cause the cones to move as the pressure is varied uponthe opposite .ends of the stones and as these stones grind themselvesfree from pressure the cones are again set up to cause pressurecontactof the stones with the the stone faces lie parallel with the axisof'the cylinder wall and the operation repeated until adjusting elementis automatic and due to the' uses of the plate like element between thecarrier and the cone adjusting element and the absence of lack ofmechanical connection between the' plate and the carrier there is nopossible binding of the plates in their respective slots each being freeto assume any of the angular relations as may be determined by thecharacter of work being operated on and each of the parts performs itsfunction without possibility of its binding or becoming locked in any ofthe adjusted positions of the plate or carriers. This freedom inoperation of the parts is secured particularly by reason of the cone andcarrier contacting points or portions being in fixed relationship one tothe other and capable of movement as a unit through the automaticmovement of the adjusting cone element, and it is to be understood thatwhile the plate like element 23 shown and described is the preferredform of element to be positioned between the carriers and adjustingcones other forms may be utilized without departing from the spirit andscope of the invention as .set forth in the appended claims.

I claim:

1. In a grinding device, a head having a central, longitudinal bore, aseries of abrading members extending longitudinally of the head incircumferentially spaced relation and radially movable relative thereto,a control element in the bore including a pair of oppositely disposedcones ment, said body having a slot for each plate' in adjustably fixedrelation movable longitudinally of the bore in either direction as aunit, a radially disposed plate for each abrading elemounted in its slotand adapted to rock therein in a plane cutting the axis of the toolproviding a construction whereby the varying pressures to which theabrading elements are subjected at their opposite ends in the grindingoperation is transmitted to the cones and causing the control element tomove as a unit to a position to equalize the pressure.

2. In a grinding device, a head having a central longitudinal bore, aseries of abrading members in circumferentially spaced relation and ra-.

dially movable relative to the axis of the head, the abrading membersconsisting of an abrasive stick and a channel like holder therefor, saidhead having grooves providing channel like portions to redirection inthe said bore, and a plate interposed between each abrading member andthe cones supported in the head and adapted to rock in a plane cuttingthe axis of the tool through a difference in pressure between oppositeends of the abrading members thereby causing the control element to moveto equalize the pressure upon the cones.

3. In a grinding device a head having a central longitudinal bore, aseries of abrading members of narrow elongated form positioned about thehead in circumferentially spaced relation, an adjustable control elementmovable longitudinally of the said bore, and a plateinterposed betweeneach abrading element and the control element, the said head having aradial slot for each of said plates in which the plates may rock in aplane cutting the longitudinal axis of the tool by reason of unequalpressure to which opposite ends of the abrading members may besubjectedin the grindment to equalize the pressure.

MARSDEN C. HU'ITO.

